I'm no expert but the t4i is not that good at the continuous auto focus, Dave dugdale from learning dslr video highlights this well. Personally the 60D would be better, I say this because of battery life, the battery life is defiantly better in terms of stills so I assume its better for video too. I also think ergonomicly it would be better if you put fast primes on it in the future due to better lens to body balance. Plus if you want to use it for stills as well which you probably will end up doing, the 60d will be better there.

Correct me if I'm wrong, but the main thing about the 650D is that it can auto-focus with video, vs the 60D that is manual focus only.STM lenses are specifically designed for this application, but it is not meant for fast moving subjects.

For fast moving subjects, you will have to use manual focusing, but that is with either camera.

So the question is do you want some instances where the camera will focus for you in video or not?